There are three main types of rocks: sedimentary, igneous, and metamorphic. Sedimentary rocks form from compacted and cemented sediments and sometimes contain fossils. Igneous rocks form from cooled magma, with extrusive rocks cooling above ground quickly and intrusive rocks cooling below ground slowly. Metamorphic rocks form from other rocks being heated and compressed, creating new rock types with interlocking crystals or foliation.

1. Science Starter: November 14, 2011 Copy the question in your science notebook. You will answer the questions for homework. What are the three rock types? What are sedimentary rocks? What are igneous rocks? What are the two types of igneous rocks? What are metamorphic rocks?

2. Types of Rocks

3. Sedimentary Rocks Made up of smaller rocks cemented together Sometimes have fossils Usually have layers.

4. Sedimentary Rocks Form when loose sediment (rocks, sand) is deposited by water, compacted, and cemented together. Form as a chemical reaction in the water that leaves a chemical deposit, usually on an ocean bottom. Form along beaches, by rivers, or under the water in lake or oceans.

5. Sedimentary Rocks

6. Examples of Sedimentary Rocks

7. Igneous Rocks Some were once liquid magma that erupted from volcanoes. They cooled very quickly. (Extrusive) Others were once liquid magma, but they did not erupt from volcanoes. Instead, they cooled slowly underground. (Intrusive)

8. Igneous Rocks Extrusive: Rocks that are from cooled lava (above ground. They cooled very quickly, therefore formed small crystals Intrusive Rocks that are from cooled magma (below ground) They cooled very slowly, therefore formed large crystals.

9. Igneous Rocks Which is extrusive and which is intrusive?

10. Igneous Rocks

11. Examples of Igneous Rock

12. Metamorphic Form when igneous, sedimentary, or other metamorphic rocks are heated and/or squished, forming a new rock type. Usually has interlocking crystals and layers (called foliation)

13. Metamorphic This can either happen underground or above ground. Underground: high pressure and heat Above ground: volcano erupting When classifying metamorphic rocks, they always come from a parent rock.

14. Metamorphic Rocks

15. Examples of Metamorphic Rocks